Hi guys! I have a CO2 sensor that has an analog output voltage of 0-4V which corresponds to 0-2000 PPM. How can I display the Correct PPM units? Im getting around 1.15V as the lowest value? How can I get around 400PPM?Pls help
rawReading = analogRead(sensorPin);ScaledReading = map(rawReading, 0, 820, 0, 2000);
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